/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.geode.management.internal.cli.parser.preprocessor;

import java.util.ArrayList;
import java.util.List;

/**
 * Basic Stack implementation, used by
 * {@link PreprocessorUtils#isSyntaxValid(String)} for detecting valid syntax
 * 
 * 
 * @param <T>
 */
public class Stack<T> {
  private List<T> list = new ArrayList<T>();

  public void push(T object) {
    list.add(object);
  }

  public T pop() {
    if (list.size() > 0) {
      int length = list.size();
      T object = list.get(length - 1);
      list.remove(length - 1);
      return object;
    } else {
      return null;
    }
  }

  public Boolean isEmpty() {
    if (list.size() == 0) {
      return true;
    } else {
      return false;
    }
  }
}
